Allegra is a distinctive girls' name in United States, ranking #2417 in 2011 with 76 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 41.1%. In 2011, approximately 1 in every 23,142 girls born was named Allegra. FALLING Recent data shows the name is currently falling.